RC Oscillators: relationship of frequency to R, C

My textbook asks: "In what type of oscillator will a change by a factor of ten in resistor values NOT result in a frequency change by a factor of ten? Choices: (a) Wien bridge; (b) Phase-shift; (c) Twin-T

My attempts at solving consisted of constructing each of these circuits on a breadboard and replacing the resistors and capacitors with different values of same. In each case, the frequency change was inversely proportional to the values of R and C.

All my research states the same theory.

Please provide guidance. I have no electronics background and am teaching myself via a self-paced course.

On 10/25 you responded to my ? (In what typ of oscillator will a change by a factor of 10 in resistor values not result in frequency change by a factor of 10 . .. Wein bridge, phase-shift or twin-t)

I wrote to the instructor asking if the textbook could be in error. they responded: "To answer this question, you need to examine the formula for frequency for each oscillator type. Each formula will contain a resistance term. Observe which of the formulas is similar and which is different. In addition, a change by a factor of 10 can be representedby multiplication 10 or by 1/10"

So, evidently, the correct answer would be the "phase shift". Just wanted to let you know since you were kind enough to respond to my inquiry.